Net income generator, always covering back (1-6)
I believe the answer is:
e-tailer
'net income generator' is the definition.
(someone who generates income on the internet)
'always covering back' is the wordplay.
'always' becomes 'eer' (poetic way of saying ever).
'covering' is an insertion indicator.
'back' becomes 'tail' (tail is a kind of back).
'eer' placed around 'tail' is 'E-TAILER'.
(Other definitions for e-tailer that I've seen before include "Shop online" , "Online merchant" .)